MATERIALS LETTERS
·
2023
·
IF 3
Cijian Zhang,Shicong Song,Qian Liu,Jiahui Li,Qi Cao,Shouhai Zhang,Xigao Jian,Zhihuan Weng
The innovative aerogel obtained by introducing bisphenol A-type polysulfone (PSF) as a precursor has excellent stability and can meet the need for thermal insulation at higher temperatures. In this study, PSF was modified by chloromethylation in a simple one-step process, and then PSF aerogels with tunable structural properties were tailored by changing the degree of chloromethyl and types of amino crosslinkers. This is the first report of the introduction of PSF into the aerogel field as far as we know. The density and volume shrinkage of the obtained aerogels were as low as 46.7 mg/cm 3 and 21.3%, respectively. Compared with aerogels made with triethylenetetramine as the cross-linking agent, aerogels obtained with polyetheramine D230 exhibited better structural stability, higher specific surface area and lower thermal conductivity (down to 0.036 W/mK), which was more favorable for the thermal insulating ability of the aerogel. These findings provide a new design idea for the selection of precursors for polymer-based aerogels.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shigui Peng,Kai Zhang,Min He,Qiao Fan,Lanlan Wei,Shuhao Qin,Tingting Luo,Lijuan Long,Jun Qin,Yufei Liu,Jie Yu
Poly(3,4-ethylenedioxythiophene) (PEDOT) is a prospective thermoelectric polymer owing to high conductivity, low thermal conductivity, and processability. However, the Seebeck coefficient of PEDOT is substantially lower than inorganics, and molecular design strategies to promote this coefficient are yet to be established. Here, the introduction of chloromethyl (-MeCl) on the surface of PEDOT has been established as an effective strategy for elevating its Seebeck coefficient. It was found that the electron-withdrawing effect of -MeCl decreases the highest occupied molecular orbital (HOMO) energy level and increases the oxidation potential of poly(chloromethylated 3,4-ethylenedioxythiophene) (PEDOT-MeCl). The space steric hindrance effect of -MeCl increases the layer spacing of PEDOT-MeCl. Furthermore, -MeCl severely disrupts the localized coplanar structure of PEDOT-MeCl, leading to a more difficult transition of the polariton into a dipolariton. Hence, PEDOT-MeCl is more difficult to be oxidatively doped, and the oxidation level is reduced compared to PEDOT. This ultimately leads to a 22.57% decrease in carrier concentration and a 33.06% increase in Seebeck coefficient for PEDOT-MeCl. This work opens up a new pathway for modulate the Seebeck coefficient of PEDOT.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 1
·141-152
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IF 6.123
Chang Longjun,Sun Yong,Gan Linhuo
To clarify the formation of pseudo-lignin during pretreatment is vital to high-value utilization of lignocellulose. In this study, hydrothermally treated bamboo and α -cellulose were employed to investigate the generation of pseudo-lignin during deep eutectic solvent (DES) treatment. It is found that pseudo-lignin not only contains some characteristic substructures of natural lignin, but also has the structural characteristics of phenol-type oxygenated and furan-type compounds. It is proposed that chloride anion probably stimulates the deconstruction of crystalline cellulose to form pseudo-lignin. Besides, it’s suggested that the change in lignin content can be reflected from the viewpoint of acid-soluble lignin to minimize the interference from pseudo-lignin, and there may exist a competition between 5-chloromethylfurfural production and pseudo-lignin formation. This study provides a feasible route to produce pseudo-lignin from α -cellulose via DES and contributes to a better understanding of pseudo-lignin formation.
研究领域:
生物质化学
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林产化工
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 9
·096505
·
IF 3.1
Zhefei Zhao,Linlin Zhang,Minghao Chen,Ruopeng Yu,Xuyao Yao,Yinghua Xu,Youqun Chu,Xinbiao Mao,Huajun Zheng
Electrochemical selective dechlorination can be regarded as one of the most promising strategies for generating high-valued chemicals. In the electrochemical dechlorination process of 2-chloro-5-trichloromethylpyridine (TCMP), except the anticipated dechlorination products involving 2-chloro-5-dichloromethylpyridine (DCMP), 2-chloro-5-chloromethylpyridine (CCMP), and 2-chloro-5-methylpyridine (CMP), some unexpected oxygen-incorporated products (6-chloronicotinic acid (CNA) and 6-chloronicotinoyl methyl ester (MCN)) can be obtained. Consequently, understanding the electrochemical dechlorination behavior of TCMP is crucial. Our research revealed that the activated Ag electrodes in halide ion solution exhibit enhanced electrochemical activities for electrochemical dechlorination of TCMP, compared with the pure Ag owing to the increased active specific surface areas and charge transfer. Second, oxygen participation in the reaction is a necessary condition for the formation of oxygen-incorporated products. A 100% selectivity of oxygen-incorporated products can be obtained at the potential of −0.6 V vs Ag/AgCl. Conversely, insufficient oxygen may lead to the potential becoming the determining condition that affects the reaction pathways. A more negative potential (−1.2 V vs Ag/AgCl) is conducive to the formation of dechlorination products with 94.2% conversion and 100% selectivity. This study, for the first time, elucidates the electrocatalyst, atmosphere, and potential-dependent activity and selectivity for the two dechlorination pathways of TCMP.
研究领域:
环境科学
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电化学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Nan Huang,Wen-Long Wang,Zi-Bin Xu,Bei Ye,Zi-Fan Liang,Min-Yong Lee,Qian-Yuan Wu,Hong-Ying Hu
In this study, it was found that monochloramine induced the formation of reactive species during ozonation of chloromethylisothiazolinone (CMIT). CMIT was found recalcitrant to chloramine. However, chloramine promoted the degradation of CMIT by ozonation significantly. Hydroxyl radicals contributed most to CMIT degradation (87%) during ozone/chloramine synergistic oxidation process (SOP). The hydroxyl radical exposure during ozone/chloramine SOP was around 7.9 times higher than that of ozonation process. The hydroxyl radical yield of ozone/chloramine SOP was estimated to be 32%. The reaction mechanisms between ozone and chloramine were postulated to include the oxygen transfer reaction to form singlet oxygen, and the formation of hydroxyl radical by the insertion pathway or electron transfer pathway. Chloramine dosage and pH are essential influencing factors. The degradation of CMIT increased from 41% to 74% with increasing chloramine dosage (0–20 μM), and then decreased to 65% when chloramine dosage continually increased to 40 μM. Ozone/chloramine SOP showed better performance at acidic or neutral conditions than basic condition. Based on the intermediates identified, the degradation pathway of CMIT during ozone/chloramine SOP included the oxidation of sulfur atom and the substitution of chlorine group by hydroxyl group. The oxidation of sulfur atom induced lower toxicities of transformation products . The toxicities of hydroxylation products were lower to fish and algae, but higher to daphnia. Based on the GC-ECD results, only trichloromethane (1.94 μg/L) was detected after ozone/chloramine SOP, accounting for 0.17% (μM/μM) of the CMIT removal.
研究领域:
环境科学
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毒理学
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水处理技术
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DOI
PubMed
高影响因子
PROCESS BIOCHEMISTRY
·
2022
·
IF 4.885
Jinmao Ma,Dongrun Wang,Wei Zhang,Xiangyu Wang,Xia Ma,Minsheng Liu,Quanlin Zhao,Lincheng Zhou,Sanxiang Sun,Zhengfang Ye
The host–guest β-cyclodextrin has attracted much attention for potential application in various fields due to its low price, natural pores, and functionality. Herein, we report a method using 1,4-phenylene diisocyanate (PPDI) to fabricate β-cyclodextrin (CD)-modified poly(chloromethyl styrene) (PCMS) resin, namely, PCMS@PPDI-CD. β-Cyclodextrin was utilized to improve the adsorption performance of PCMS, which was then applied to anchor β-cyclodextrin powder. The product exhibits excellent renewability and availability due to the application of PCMS. The adsorption performance was fully exerted by the combination of β-cyclodextrin and PCMS. SEM mapping, FTIR, TG , BET, and XPS analyses were conducted to explore the morphological and structural properties of PCMS@PPDI-CD. Adsorption experiments show that PCMS@PPDI-CD removed 100 % of TC and 75 % of Cu(Ⅱ), and the maximum adsorption capacity for Cu(Ⅱ) and TC reached 187.6 and 266.4 mg g −1 , respectively. After recycling six times, the adsorption ability of Cu(Ⅱ) and TC still achieved excellent removal performance. In addition, the chelation of the lone N pair, the hydrophobicity of the cavity, H-bonding, complexation, n-π interaction, and porous structure showed the possible mechanism. We used computational formulas to simulate the adsorption state and found that the resin is theoretically feasible. Most importantly, we propose a novel application of PCMS@PPDI-CD. This work shows that the resulting PCMS@PPDI-CD is highly efficient and can be easily recycled, making it an attractive resin for adsorption.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2020
·
IF 4.389
Sheng Yan,Ming-Ming Tu,Yun-Ren Qiu
Polysulfone (PSf) membrane is widely employed in blood purification fields, but the blood compatibility of PSf membrane is not adequate. To improve the hemocompatibility of PSf membrane, 4-(chloromethyl)benzoic acid (CMBA) and sulfonated hydroxypropyl chitosan (SHPCS) were grafted onto PSf membrane surface. In our strategy, CMBA was firstly grafted on the PSf membrane surface through the Friedel-Crafts alkylation reaction, and the product was named BAPSf membrane. Then, SHPCS was grafted onto the BAPSf membrane surface by esterification , and the product was named SHPCS-BAPSf membrane. The effects of temperature and reaction time on the productivity of BAPSf and the grafting density of carboxyl and the effects of reaction time on the grafting density of SHPCS grafted onto the BAPSf membrane surface were studied. The SHPCS-BAPSf membranes are investigated by ATR-FTIR, XPS , contact angle measurements and evaluated by blood compatibility in vitro. The results reveal that the hydrophilicity of SHPCS-BAPSf membranes were grealy improved and the evaluation of protein adsorption , hemolysis test, platelet adhesion plasma recalcification time(PRT), activated partial thromboplastin time(APTT), prothrombin time(PT) and thrombin time(TT) confirmed that the SHPCS-BAPSf membranes have remarkable blood compatibility.
研究领域:
生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Lin Zhou,Yangcheng Lu
Polystyrene-based magnetic composite nanoparticles with well-defined core-shell morphology, customizable surface functionalization , and adjustable magnetic properties are promising catalyst support materials. In this work, chloromethylated magnetic polystyrene composite nanoparticles are successfully prepared through RAFT-mediated surfactant-free emulsion polymerization . A comprehensive investigation is carried out to explore the influence of copolymer monomer ratios and polymerization degrees on emulsion polymerization conversion and encapsulation efficiency. The results unveil the critical importance of moderately adjusting the hydrophobic/hydrophilic properties of the macroRAFT agents in achieving an effective encapsulation process. Excessive monomer addition is found to disrupt the conditions necessary for emulsion polymerization by causing the detachment of macroRAFT agents from the surface of the modified Fe 3 O 4 nanoclusters . These results are instructive for the future rational design and synthesis of high-performance catalysts.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Sustainability
·
2023
·Vol. 15
·期 4
·3657
·
IF 3.9
Jinmao Ma,Xiangyu Wang,Xu Zhang,Zhengfang Ye,Sanxiang Sun,Lincheng Zhou
Fenton technology has excellent performance in the treatment of hard-to-degrade organics but tends to cause secondary pollution to the environment. Given its excellent adsorption capacity and the availability of mature adsorption modification studies, poly(chloromethyl styrene)-based resin (PS-Cl) has received much attention for the adsorption of heavy metal ions. However, combining the mature Fenton technology with the highly popular PS-Cl through a stable bridge to exploit the advantages of catalytic degradation performance of Fenton-like technology is the main focus of our work. The PS-NH2@FeSe2catalyst with a core–shell structure was synthesized. The catalytic degradation of tetracycline solution in the presence of PS-NH2@FeSe2and persulfate achieved a satisfactory effect. The removal efficiency was as high as 85.94% within 2 h, and the degradation rate constant was 0.02352 min−1. The main advantages of the PS-NH2@FeSe2catalyst were high stability and recyclability. Thus, the catalyst would not cause secondary pollution to the environment and could still achieve a degradation efficiency of nearly 70% for TC after five times of reuse. The possible catalytic degradation pathways and potential removal mechanisms were investigated through free-radical quenching experiments and HPLC-MS detection of intermediates generated through catalytic degradation. Column experiments were conducted to investigate the effect of the catalyst on the actual removal of wastewater, and a simple flow model was developed using Yellow River water to make the integration of theory and practice possible. In conclusion, the new idea constructed with FeSe2-loaded modified resin offers promising prospects in the removal of refractory organic compounds, such as tetracycline.Keywords:modified resins;iron selenide;catalytic reaction;TC
研究领域:
环境科学
·
化学工程
·
材料科学
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产品关联
DOI
高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Zhangwei Yuan,Yichen Dou,Jiace Liang,Wenjuan Xiong,Meichen Liu,Yuanbo Song,Mengjun Liu,Tiancan Zhang,Ziyue Qiang,Yong Peng,Zhiliang Ku
Recent advancements in inverted perovskite solar cells have highlighted the role of self-assembled monolayer (SAM) hole transport layers, which offer thin profiles, ease of fabrication, and effective hole extraction, thereby enhancing solar cell efficiency. However, producing high-performance SAM films on rough substrates using traditional spin-coating is challenging due to the large, flat nature of typical SAM molecules, which leads to aggregation and insufficient film density. This can expose substrate areas to the perovskite layer, risking short circuits and compromising efficiency and stability. To overcome these challenges, we adopted a dip-coating adsorption method to prepare the SAM film while introducing chloromethylphosphonic acid (CPA) small molecules to occupy aggregation-induced vacancies. Our findings show that SAM molecules can successfully form dense films on rough FTO substrates using dip-coating, with CPA effectively filling gaps. Moreover, the chlorine groups in CPA enhance the vapor phase growth of the perovskite layer, reducing voids and promoting larger grain sizes. This dip-coating technique facilitated the development of a high-performance SAM/CPA composite hole transport layer, resulting in a perovskite solar cell with a power conversion efficiency of 21.37 %, which maintained 82.44 % efficiency after 1000 h of operation at maximum power.
研究领域:
材料科学
·
能源技术
·
光伏器件
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Jinmao Ma,Quanlin Zhao,Zhengfang Ye
Chloromethyl styrene resin can undergo specific chemical modifications and is an excellent adsorbent material for treating difficult-to-degrade substances in wastewater. In this study, chloromethyl styrene resin will be used as a carrier, and polystyrene chloromethyl resin (PS-Cl) was converted into PS-NH 2 by amino modification. The self-assembly of cobalt-based metal–organic framework (CoMOF) was induced on the surface of PS-NH 2 by using a novel preparation technique. The performance of the prepared PS-NH 2 @CoMOF self-assembled catalysts with core–shell-like structures in degrading the target pollutant, tetracycline (TC), was evaluated. The catalysts effectively induced rapid OH radical production from H 2 O 2 , had a degradation rate of as high as 88.3 % for 20 mg/L TC solution, and were highly stable and adaptable to aqueous environments. Free radicals and intermediates in the catalytic degradation process were detected by electron paramagnetic resonance and high-performance liquid chromatography mass spectrometry, and possible catalytic degradation pathways were analyzed. The catalytic dissociation behavior of H 2 O 2 in the presence of different catalysts was studied in depth and compared with that of similar metal–organic framework materials through density-functional theory calculations. Results demonstrated the excellent performance of the PS-NH 2 @CoMOF catalysts. Finally, the catalysts' potential for use in practical engineering applications was evaluated with a flow column experimental model, and the results were more than satisfactory. Therefore, the use of the catalysts to degrade TC has great potential.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2015
·
IF 1.098
Tong Liu,Tiefeng Wang,Yunlong Huang,Chao Wang,Jinfu Wang
Methylphenyldichlorosilane (MPDS, CH 3 C 6 H 5 SiCl 2 ) is an important silicone monomer for the synthesis of high-performance polymethylphenylsiloxane polymers. In this work, the mechanism of the synthesis of MPDS from methyldichlorosilane and chlorobenzene by gas phase condensation was studied, and a kinetic model with 35 species and 58 elementary reactions was established. Experiments were carried out in a tubular reactor under a wide range of reaction conditions. The calculated mole fractions of the reactants and products were in a good agreement with the experimental results. A mechanism of the insertion of chloromethylsilylene into the C Cl bond of chlorobenzene was proposed, which was proved to be the main pathway of MPDS production. The established kinetic model can be used in design and optimization of the industrial reactor for MPDS synthesis.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）